28393271 has 2 divisors, whose sum is σ = 28393272. Its totient is φ = 28393270.

The previous prime is 28393259. The next prime is 28393297. The reversal of 28393271 is 17239382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28393271 - 2⁶ = 28393207 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28393231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14196635 + 14196636.

It is an arithmetic number, because the mean of its divisors is an integer number (14196636).

Almost surely, 2^28393271 is an apocalyptic number.

28393271 is a deficient number, since it is larger than the sum of its proper divisors (1).

28393271 is an equidigital number, since it uses as much as digits as its factorization.

28393271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 28393271 is about 5328.5336632135. The cubic root of 28393271 is about 305.0739621757.

The spelling of 28393271 in words is "twenty-eight million, three hundred ninety-three thousand, two hundred seventy-one".